wizard DNA clean up

Howdy people. Has anyone used either the Wizard DNA cleanup or PCR
preps to isolate a LARGE piece of DNA from a normal agarose gel.
Their 'propaganda' says the systems should be able to handle pieces
as large as 15 or 23kb. How have they worked in the field? What
about Bio-Rad's Prep-a-gene? The piece I want to gel purify is a
10kb fragment from a restriction digest.
One other point. For those using other Wizard columns, but not
"vacuthingy", try the 'VacMan Jr.' Its only $20 here in Canada
(better than the $400 for the vacuum manifold).
Rick Martel
Simon Fraser University
richardk at sfu.ca